Lettuce is a staple in salads, wraps, and low-carb meals, but its carbohydrate content varies significantly by variety. Iceberg, romaine, butterhead, and leaf lettuce all have different carb counts per 100 grams, which matters for keto, diabetic, or general calorie-conscious diets. This calculator lets you quickly find the exact carbs (total and net) for any lettuce type, with optional serving size adjustment.
Whether you're tracking macros, planning a low-carb meal, or just curious about the nutritional profile of your greens, this tool provides instant, accurate results. Simply select the lettuce variety, enter a serving weight, and get total carbs, fiber, and net carbs per 100g and per your serving. Perfect for meal prep, diet planning, and nutrition education.
🥬 Lettuce Carbs Calculator
How to Use This Tool
Select the lettuce variety from the dropdown — options include Iceberg, Romaine, Butterhead, Green Leaf, Red Leaf, Arugula, Spinach, and Mixed Greens. Enter your serving weight in grams (default is 100g). Use the preset buttons (50g, 100g, 150g, 200g) for quick common portions. Click "Calculate" to see total carbs, fiber, and net carbs for your serving, plus the per-100g values for easy comparison. Use "Reset" to clear and start over.
How It Works
The calculator uses standard nutritional data from the USDA FoodData Central database. Each lettuce variety has a known carbohydrate and fiber content per 100 grams. When you enter a serving weight, the tool multiplies these values by the ratio of your serving to 100g. Net carbs are calculated as total carbs minus fiber, which is the standard method for low-carb and keto diet tracking. The formula is: Net Carbs = Total Carbs − Fiber. For example, Romaine lettuce has 3.3g total carbs and 2.1g fiber per 100g, giving 1.2g net carbs per 100g.
Example Calculations
Example 1: You eat a salad with 150g of Romaine lettuce. Total carbs = 3.3 × 1.5 = 4.95g. Fiber = 2.1 × 1.5 = 3.15g. Net carbs = 4.95 − 3.15 = 1.8g. Per 100g: 3.3g total, 2.1g fiber, 1.2g net.
Example 2: You use 80g of Iceberg lettuce in a wrap. Total carbs = 2.9 × 0.8 = 2.32g. Fiber = 1.2 × 0.8 = 0.96g. Net carbs = 2.32 − 0.96 = 1.36g. Per 100g: 2.9g total, 1.2g fiber, 1.7g net.
Tips for Accurate Tracking
Weigh your lettuce on a kitchen scale for the most accurate results. Pre-shredded or bagged lettuce may have slightly different moisture content, but the carb values remain very close. For mixed greens, the calculator uses an average of common spring mix components. If you're on a strict keto diet (under 20g net carbs per day), lettuce is an excellent low-carb choice — even a large 200g serving of Romaine provides only about 2.4g net carbs.
Frequently Asked Questions
Is lettuce really low in carbs? Yes, all lettuce varieties are low in carbs. Iceberg has the lowest total carbs (2.9g per 100g), while arugula and spinach are slightly higher but still very low. Net carbs are even lower due to fiber content.
Can I use this for keto? Absolutely. Net carbs are the key metric for keto. Lettuce is a keto-friendly food — even the highest-carb variety (arugula) has only about 2.1g net carbs per 100g.
Why does fiber subtract from carbs? Fiber is a carbohydrate that the body cannot digest, so it does not raise blood sugar or contribute calories. For low-carb and diabetic diets, subtracting fiber gives a more accurate picture of digestible carbs.
Are the values for raw or cooked lettuce? All values are for raw, fresh lettuce. Cooking lettuce is uncommon, but if you do, the water content changes and carb density may increase slightly. For cooked greens like spinach, use a separate calculator.
Where does the data come from? The nutritional values are sourced from the USDA FoodData Central database, which is the standard reference for food composition in the United States. For more details, visit the USDA FoodData Central website.
Real-World Applications
This calculator is useful for meal prep, diet planning, and nutrition education. Whether you're following a ketogenic diet, managing diabetes, counting macros for fitness, or simply trying to eat more vegetables, knowing the exact carb content of your lettuce helps you make informed choices. Lettuce is also a great way to add volume to meals without adding many carbs — perfect for weight management. For other vegetable carb counts, check out our Onion Carbs Per 100g Calculator or Cabbage Carbs Calculator.